[linux-dvb] [PATCH] make dvb_ringbuffer compatible to dmxdev_buffer

Andreas Oberritter obi at linuxtv.org
Tue Mar 14 18:57:54 CET 2006


On Tue, 2006-03-14 at 13:46 +0100, Oliver Endriss wrote:
> It will break the av7110 driver.

OK, so I will send another patch to revert that part to Mauro.

> How could setting the buffer ptr to 0 increase performance?
> Usually it will save a single wrap of the buffer.

Yes, if the data starts at 0 that's one copy_to_user() vs. two when
reading the buffer. The start of the buffer is page aligned, and proper
alignment is IMHO required for fast copy operations.

Regards,
Andreas




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